Add a flag that allows us to truncate the reflog before we write the update.

Signed-off-by: Ronnie Sahlberg <sahlb...@google.com>
---
 refs.c | 12 ++++++++++--
 refs.h |  4 +++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/refs.c b/refs.c
index d8a1568..a8b583a 100644
--- a/refs.c
+++ b/refs.c
@@ -3608,7 +3608,11 @@ int transaction_commit(struct ref_transaction 
*transaction,
                }
        }
 
-       /* Update all reflog files */
+       /* Update all reflog files
+          We have already done all ref updates and deletes.
+          There is not much we can do here if there are any reflog
+          update errors, other than complain.
+       */
        for (i = 0; i < n; i++) {
                struct ref_update *update = updates[i];
 
@@ -3616,7 +3620,11 @@ int transaction_commit(struct ref_transaction 
*transaction,
                        continue;
                if (update->reflog_fd == -1)
                        continue;
-
+               if (update->flags & REFLOG_TRUNCATE)
+                       if (lseek(update->reflog_fd, 0, SEEK_SET) < 0 ||
+                           ftruncate(update->reflog_fd, 0)) {
+                               error("Could not truncate reflog");
+                       }
                if (log_ref_write_fd(update->reflog_fd, update->old_sha1,
                                     update->new_sha1,
                                     update->committer, update->msg)) {
diff --git a/refs.h b/refs.h
index 2e22a26..b1b97e7 100644
--- a/refs.h
+++ b/refs.h
@@ -269,8 +269,10 @@ int transaction_delete_sha1(struct ref_transaction 
*transaction,
                            const unsigned char *old_sha1,
                            int flags, int have_old, const char *msg);
 
+#define REFLOG_TRUNCATE 0x01
 /*
- * Append a reflog entry for refname.
+ * Append a reflog entry for refname. If the REFLOG_TRUNCATE flag is set
+ * this update will first truncate the reflog before writing the entry.
  */
 int transaction_update_reflog(struct ref_transaction *transaction,
                              const char *refname,
-- 
2.0.0.rc3.506.g3739a35

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